Know Your Environment. Protect Your Health.

Heptachlor

Dierks Water Works

Heptachlor is an insecticide used for termite control until 1988. It is linked to cancer, hormone disruption and neurotoxicity.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019N/A00N/A
2020N/A00N/A
2021ND40ND
2022ND50ND
2023ND20ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.008 ppb

The EWG Health Guideline of 0.008 ppb for heptachlor was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL): 0.4 ppb

The legal limit for heptachlor, established in 1991, was based on analytical detection limits at the time that the standard was set. This limit may not fully protect against the risk of cancer due to heptachlor exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2018-04-2418115001506ND
2021-04-1421105010306ND
2021-05-2521147007901ND
2021-08-0321217001901ND
2021-10-1921294001301ND
2022-01-1122013001201ND
2022-04-20O197084-OGC-1ND
2022-08-24O201154-OGC-1ND
2022-10-25O203130-OGC-1ND
2022-11-16O203928-OGC-1ND
2023-01-11O205155-OGC-1ND
2023-05-15O209162-OGC-1ND